Working alongside your design team from the earliest stage, we help you select the right part for the application and, where a standard part will not do, develop customised components with our manufacturing partners such as lead length, termination and package size.
The USR-SF series from Alpha Electronics is an ultra-stable primary standard resistor which is an enhanced version of the USR / ASR series. The ultra-stable resistive element utilises the new generation stress-free Bulk Metal® foil technology, which results in an extremely low temperature coefficient of ±0.05 ppm/°C at +23°C ±5°C. This performance is unique to Alpha Electronics throughout the world.
The stress-free resistance element eliminates stress factors by using a special treatment process, and is encapsulated in a specially-designed ceramic case to protect against humidity, oxidation and vibration during transportation. Alpha’s Bulk Metal® foil construction provides excellent AC characteristics, superior in performance compared to conventional wire-wound standard resistors.
The USR-SF, with its extreme long-term stability and low TCR, can be used in normal air environments, which eliminates the additional cost of operating and maintaining oil baths.
The USR-SF series has a weight of approximately 2.2kg and dimensions of 155mm x 97mm x 112mm.
The below table gives the full specifications for each model available of the Alpha USR-SF series:
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